EP1010553A2 - Pneumatic tyre - Google Patents
Pneumatic tyre Download PDFInfo
- Publication number
- EP1010553A2 EP1010553A2 EP99310171A EP99310171A EP1010553A2 EP 1010553 A2 EP1010553 A2 EP 1010553A2 EP 99310171 A EP99310171 A EP 99310171A EP 99310171 A EP99310171 A EP 99310171A EP 1010553 A2 EP1010553 A2 EP 1010553A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- collector
- tread
- pneumatic tyre
- rubber
- tyre according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
- B60C11/0309—Patterns comprising block rows or discontinuous ribs further characterised by the groove cross-section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C19/00—Tyre parts or constructions not otherwise provided for
- B60C19/08—Electric-charge-dissipating arrangements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S152/00—Resilient tires and wheels
- Y10S152/02—Static discharge
Definitions
- the present invention relates to a pneumatic tyre having a tread portion made of a low-hysteresis-loss rubber compound and static electricity grounding means.
- a pneumatic tyre having static electricity grounding means wherein the tread portion (A) is made of a silica-reinforced rubber (b) and an electrically conductive carbon-reinforced rubber (a) as shown in Fig.4.
- the conductive carbon-reinforced rubber (a) is provided with parts (a1) extending radially outwardly to the ground contacting face (bs) of the tread portion.
- the ground contacting region is defined by two kinds of rubber compounds. Therefore, uneven wear is liable to occur therebetween. If the radially outwardly extending parts (a1) wear faster than the tread rubber (b), the electrical resistance between the tyre and the ground increases. If the tread rubber (b) wears faster than the parts (a1), there is a possibility that the grip performance deteriorates. Further, it is difficult to form the radially extending parts (a1) with accuracy because the rubber is softened during vulcanising the tyre and flows more or less. Furthermore, an increase in the tyre making processes and/or an increase in the equipment cost may be unavoidable.
- an object of the present invention to provide a pneumatic tyre which can solve the above-mentioned problems, namely, the increase in the electrical resistance and deterioration of the grip performance due to the uneven wear, and the lowering of accuracy, and the increase in the tyre making processes and/or equipment cost.
- a pneumatic tyre comprises a tread rubber comprising a low-hysteresis-loss rubber compound containing silica as a reinforcing agent, the tread rubber extending over a ground contacting region of the tyre, tread grooves disposed in the ground contacting region, characterised by static electricity grounding means comprising a grounding terminal and a collector, the collector and grounding terminals being made of a conductive rubber compound containing at least 15 phr of carbon black to have a volume resistivity of less than 100 megaohm cm, said collector being disposed radially inside the tread grooves, and said grounding terminals being disposed in the tread grooves and extending radially outwardly from the collector to the level of the ground contacting region at least.
- a pneumatic tyre 1 according to the present invention comprises a tread portion 2, a pair of sidewall portions 3, a pair of bead portions 4 each with a bead core 5 therein, a carcass 6 extending between the bead portions 4, and a belt 7 disposed radially outside the carcass 6.
- the tyre 1 is a radial tyre for passenger cars.
- the carcass 6 comprises at least one ply 6A, in this embodiment only one ply, of cords arranged radially at an angle of from 75 to 90 degree with respect to the tyre equator C, and extending between the bead portions 4 through the tread portion 2 and sidewall portions 3, and turned up around the bead core 5 in each of the bead portions to be secured thereto.
- the belt comprises a breaker belt 7 and optionally a bandage or band belt (not shown).
- the breaker belt 7 is composed of at least two plies 7A and 7B of cords, wherein the cords of each ply are laid at an angle of not more than 30 degree with respect to the tyre equator C in parallel with each other but crosswise to those of the other ply.
- steel cords are used in this example.
- other metallic cords, carbon fibre cords or the like may be used.
- non-conductive organic cords may be used.
- the belt cords are rubberised with a topping rubber which is a conductive rubber compound having a volume resistivity of less than 100 megaohm cm.
- the above-mentioned tread portion 2 comprises a tread rubber 11 as the radially outermost rubber layer defining the ground contacting region 2S.
- the tread rubber 11 extends over the entire width of the tread portion 2.
- the tread rubber 11 is made of a high performance rubber compound which is designed with much importance attached to the wear resistance, rolling resistance, wet performance and the like rather than the electrical conductivity.
- the compound contains 30 to 100 phr, preferably 40 to 70 phr of silica in the base rubber material, but the carbon black content is limited to at most 15 phr, preferably 10 phr. As a result, it has a volume resistively of more than 100 megaohm cm and is thus non-conductive.
- the tread portion 2 is provided in the ground contacting region 2S with tread grooves G.
- the tread grooves G may include various grooves, e.g. circumferential grooves, bias grooves, axial grooves and the like. Static electricity grounding means (12) are provided in the tread grooves G.
- the static electricity grounding means 12 comprises a collector 12A and grounding terminals 12C which are made of a conductive rubber compound.
- the collector 12A is disposed radially inside the tread rubber 11 and on the radially outer surface of the conductive belt 7.
- the grounding terminals 12C are disposed in the tread grooves G.
- the collector 12A is relatively thin so as not to hinder the tread rubber 11 from decreasing the rolling resistance of the tyre.
- the thickness thereof is preferably set in the range of from 1 to 4 mm.
- the grounding terminals 12C extend radially outwardly from the collector 12A to the level of the tread surface at least. Usually, they extend slightly beyond the tread surface.
- the length L of the protruding part is set in the range of from 2 to 8 mm when the tyre is new.
- each of the static electricity grounding terminals 12C is set in the range of from 0.5 to 3.0 mm, preferably 1.0 to 2.0 mm, whereby a flexibility suitable for providing a sufficient electrical contact with the ground can be obtained.
- the thickness may occur in any direction, namely tyre circumferential direction, axial direction or the like.
- the thickness is the maximum thickness.
- the minimum thickness is at least equal to 0.5 mm to provide the required minimum strength.
- the thickness is less than 0.5 mm, it is difficult to obtain a required minimum strength, and the electrical resistance becomes very high. If more than 3.0 mm, as the rigidity increases, tearing-off is liable to occur when taking the tyre from the mould.
- the number of the grounding terminals 12C in the ground contacting patch is at least one, preferably at least five, more preferably more than ten.
- the grounding terminals 12C are formed in each circumferential groove at substantially regular intervals of 1.0 to 3.0 cm.
- the static electricity grounding terminals 12C may have various cross sectional shapes (round, rectangle, polygons, etc) when viewed from the radially outside. However, a round shape is preferred.
- the collector 12A extends over the entire width of the tread portion 2, but it can be formed in a narrower width. Further, it may be formed as separate parts disposed radially inside the tread grooves G, respectively.
- the conductive rubber compound contains at least 15 phr, preferably more than 20 phr, more preferably more than 40 phr of carbon black in the base rubber material so as to have a volume resistivity of less than 100 megaohm cm. As far as the relatively low volume resistivity in this range can be maintained, a smaller amount of silica may be add to utilise its excellent properties.
- the volume resistivity of a conductive rubber has a close relationship with the content and average particle diameter of the carbon black.
- the ratio Wc/Nc of the content Wc in phr of the carbon black to the average particle diameter Nc in nm of the carbon black is preferably set in the range of not less than 1.5.
- hard carbon whose average particle diameter Nc is not more than 30 nm is preferably used. As a result, the necessary conductivity can be stably secured.
- diene rubber such as natural rubber (NR), styrene butadiene rubber (SBR), butadiene rubber (BR), isoprene rubber (IR) and the like can be used, either alone or in combination.
- additives such as sulphur, vulcanising accelerator, age resistance and the like may be used.
- the collector rubber 12A is exposed in the groove bottom Gs. However, it is also possible that the collector rubber 12A is covered with the tread rubber 11 as shown in Fig.2(B). Further, in order to improve the resistance to tearing-off, it is possible to gradually increase the thickness of a root part 12B of the grounding terminal 12C as shown in Fig.2(B).
- an electrical path is formed by conductive rubber layers disposed in the sidewall portions and bead portions, and/or conductive topping rubber for reinforcing cords such as the carcass cords, belt cords and the like, and if applicable, conductive reinforcing cords such as steel belt cords and the like.
- grounding terminals 12C can be formed by simply making holes in the inner surface of a tyre vulcanising mould. The positions of those holes are on the tip of ribs which are negative impressions of the tread grooves G.
- Test tyres of size 195/65R14 were made and the electrical resistance was measured.
- the test tyres were the same structure shown in Fig.1 except for the ingredients of the tread rubber compounds and the number and size of the terminals.
- the electrical resistance was measured according to a German method, WDK, Blatt 3.
- the test tyre 1 mounted on a standard rim R (size 6X14) and inflated to a pressure of 200 kpa was pressed against a copper plate 31 on a table 30 by applying a tyre load (150, 250, 350 and 450 kg), and the electrical resistance between the rim R and the plate 31 was measured with a ohm meter 32, applying 1000 volts therebetween.
- a tyre load 150, 250, 350 and 450 kg
- the pneumatic tyre according to the present invention has the static electricity grounding means which are provided, as flexible terminals, in the tread grooves formed in the low-hysteresis-loss tread rubber. Therefore, the problems in the above-mentioned prior art can be solved, and excellent dynamic performances derived from the silica-reinforced rubber and a good static-electricity-grounding effect can be maintained for a long term.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
Tyre | Ref.1 | Ref. 2 | Ex.1 | Ex.2 | Ex.3 | Ex.4 |
Carbon black (phr) Tread | 5 | 5 | 5 | 5 | 5 | 5 |
Conductive rubber | 0 | 30 | 30 | 30 | 30 | 30 |
Terminal | None | none | round | round | round | round |
Diameter (mm) | 1.2 | 1.2 | 1.2 | 1.2 | ||
Number | 0 | 0 | 5 | 10 | 15 | 20 |
Electric resistance of tyre (megaohm) Tyre load | ||||||
150 kg | Over 2000 | over 2000 | 365 | 50 | 4.53 | 1.2 |
250 kg | Over 2000 | over 2000 | 588 | 56.2 | 4.76 | 1.43 |
350 kg | Over 2000 | over 2000 | 621 | 75.2 | 4.98 | 1.59 |
450 kg | Over 2000 | over 2000 | 888 | 88.4 | 5.04 | 2.21 |
Claims (11)
- A pneumatic tyre comprising a tread rubber comprising a low-hysteresis-loss rubber compound containing silica as a reinforcing agent, the tread rubber extending over a ground contacting region of the tyre, tread grooves (G) disposed in the ground contacting region, characterised by static electricity grounding means (12) comprising a grounding terminal (12C) and a collector (12A), the collector (12A) and grounding terminals (12C) being made of a conductive rubber compound containing at least 15 phr of carbon black to have a volume resistivity of less than 100 megaohm cm, said collector (12A) being disposed radially inside the tread grooves (G), and said grounding terminals (12C) being disposed in the tread grooves (G) and extending radially outwardly from the collector (12A) to the level of the ground contacting region at least.
- A pneumatic tyre according to claim 1, characterised in that the grounding terminals (12C) have a thickness of from 0.5 to 3.0 mm.
- A pneumatic tyre according to claim 1 or 2, characterised in that the grounding terminals (12C) protrude radially outwardly from the tread groove top by a length (L) of from 2 to 8 mm.
- A pneumatic tyre according to claim 1, 2 or 3, characterised in that the grounding terminals (12C) have a round cross sectional shape.
- A pneumatic tyre according to any of claims 1 to 4, characterised in that the grounding terminals (12C) are spaced in circumferential grooves at a substantially regular intervals of 1.0 to 3.0 cm.
- A pneumatic tyre according to any of claims 1 to 5, characterised in that the number of the grounding terminals (12C) in the ground contacting patch is at least five.
- A pneumatic tyre according to any of claims 1 to 6, characterised in that the thickness of each grounding terminal (12C) gradually increases in its root part.
- A pneumatic tyre according to any of claims 1 to 7, characterised in that the rubber of the collector (12A) is exposed in the groove bottom.
- A pneumatic tyre according to any of claims 1 to 8, characterised in that the collector (12A) is covered with the tread rubber in the groove bottom.
- A pneumatic tyre according to any of claims 1 to 9, characterised in that the collector (12A) extends over the width of the tread portion.
- A pneumatic tyre according to any of claims 1 to 10, characterised in that the collector (12A) is made up of separate parts disposed radially inside the tread grooves, respectively.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10359618A JP3045494B1 (en) | 1998-12-17 | 1998-12-17 | Pneumatic tire |
JP35961898 | 1998-12-17 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1010553A2 true EP1010553A2 (en) | 2000-06-21 |
EP1010553A3 EP1010553A3 (en) | 2000-11-08 |
EP1010553B1 EP1010553B1 (en) | 2003-11-12 |
Family
ID=18465422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99310171A Expired - Lifetime EP1010553B1 (en) | 1998-12-17 | 1999-12-17 | Pneumatic tyre |
Country Status (4)
Country | Link |
---|---|
US (1) | US6343634B1 (en) |
EP (1) | EP1010553B1 (en) |
JP (1) | JP3045494B1 (en) |
DE (1) | DE69912724T2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1526005A2 (en) * | 2003-10-23 | 2005-04-27 | The Goodyear Tire & Rubber Company | Pneumatic tire with electrically conductive cord extending between a bead portion and a tread portion of the tire |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002002223A (en) * | 2000-06-21 | 2002-01-08 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
KR20020039985A (en) * | 2000-11-23 | 2002-05-30 | 조충환 | Pneumatic tire for reduced noise |
JP2007153092A (en) | 2005-12-02 | 2007-06-21 | Sumitomo Rubber Ind Ltd | Pneumatic tire, and manufacturing method of the pneumatic tire |
JP4977144B2 (en) * | 2006-09-25 | 2012-07-18 | 東洋ゴム工業株式会社 | How to install a pneumatic tire |
JP5027476B2 (en) * | 2006-10-18 | 2012-09-19 | 住友ゴム工業株式会社 | Combination tire |
JP4933349B2 (en) * | 2007-05-28 | 2012-05-16 | 株式会社ブリヂストン | Pneumatic tire |
WO2009066605A1 (en) * | 2007-11-21 | 2009-05-28 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire and production method therefor |
JP4571664B2 (en) * | 2007-12-20 | 2010-10-27 | 住友ゴム工業株式会社 | Pneumatic tire and manufacturing method thereof |
JP4962738B2 (en) * | 2008-05-12 | 2012-06-27 | 横浜ゴム株式会社 | Pneumatic tire |
JP5624369B2 (en) * | 2010-06-02 | 2014-11-12 | 住友ゴム工業株式会社 | Pneumatic tire and manufacturing method thereof |
WO2015100435A1 (en) | 2013-12-26 | 2015-07-02 | Bridgestone Americas Tire Operations, Llc | Tire tread having a flexible gate apparatus |
US20180178595A1 (en) * | 2015-06-15 | 2018-06-28 | Bridgestone Americas Tire Operations, Llc | Tire having a conductivity path |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH597008A5 (en) * | 1977-02-23 | 1978-03-31 | Nicolas Aeschmann | Pneumatic tyre for mounting on metal rim of vehicle wheel |
EP0718127A1 (en) * | 1994-12-21 | 1996-06-26 | Sp Reifenwerke Gmbh | Vehicle tyre |
EP0747243A1 (en) * | 1995-06-08 | 1996-12-11 | Sp Reifenwerke Gmbh | Vehicle tyre with dissipation of electrostatic charges |
JPH0971112A (en) * | 1994-12-21 | 1997-03-18 | Sumitomo Rubber Ind Ltd | Pneumatic tire and manufacture thereof |
EP0847880A1 (en) * | 1996-10-17 | 1998-06-17 | Sumitomo Rubber Industries Limited | Pneumatic tyre |
EP0878330A2 (en) * | 1997-05-12 | 1998-11-18 | Sumitomo Rubber Industries Limited | Vehicle tyre |
EP0890460A1 (en) * | 1997-03-18 | 1999-01-13 | Bridgestone Corporation | Antistatic tire |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2641294A (en) * | 1950-06-13 | 1953-06-09 | Bridgefield Guillermo Palacios | Electric current discharge rubber tire |
GB903389A (en) * | 1957-09-30 | 1962-08-15 | Pirelli | Improvements in or relating to pneumatic tyres |
JPH02189204A (en) * | 1989-01-19 | 1990-07-25 | Bridgestone Corp | Rib tire of low noise |
GB9409453D0 (en) * | 1994-05-12 | 1994-06-29 | Sumitomo Rubber Ind | tyre tread and tyres incorporating them |
DE4417914A1 (en) * | 1994-05-21 | 1995-11-23 | Ralf Schoeppe | Electrostatic charge build-up prevention system for metallic vehicles on rubber tyres |
JPH08183309A (en) * | 1994-12-29 | 1996-07-16 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
US6044882A (en) * | 1995-03-07 | 2000-04-04 | The Goodyear Tire & Rubber Company | Tire having silica reinforced rubber tread with outer cap containing carbon black |
-
1998
- 1998-12-17 JP JP10359618A patent/JP3045494B1/en not_active Expired - Fee Related
-
1999
- 1999-12-13 US US09/458,709 patent/US6343634B1/en not_active Expired - Fee Related
- 1999-12-17 EP EP99310171A patent/EP1010553B1/en not_active Expired - Lifetime
- 1999-12-17 DE DE69912724T patent/DE69912724T2/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH597008A5 (en) * | 1977-02-23 | 1978-03-31 | Nicolas Aeschmann | Pneumatic tyre for mounting on metal rim of vehicle wheel |
EP0718127A1 (en) * | 1994-12-21 | 1996-06-26 | Sp Reifenwerke Gmbh | Vehicle tyre |
JPH0971112A (en) * | 1994-12-21 | 1997-03-18 | Sumitomo Rubber Ind Ltd | Pneumatic tire and manufacture thereof |
EP0747243A1 (en) * | 1995-06-08 | 1996-12-11 | Sp Reifenwerke Gmbh | Vehicle tyre with dissipation of electrostatic charges |
EP0847880A1 (en) * | 1996-10-17 | 1998-06-17 | Sumitomo Rubber Industries Limited | Pneumatic tyre |
EP0890460A1 (en) * | 1997-03-18 | 1999-01-13 | Bridgestone Corporation | Antistatic tire |
EP0878330A2 (en) * | 1997-05-12 | 1998-11-18 | Sumitomo Rubber Industries Limited | Vehicle tyre |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 07, 31 July 1997 (1997-07-31) & JP 09 071112 A (SUMITOMO RUBBER IND LTD), 18 March 1997 (1997-03-18) * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1526005A2 (en) * | 2003-10-23 | 2005-04-27 | The Goodyear Tire & Rubber Company | Pneumatic tire with electrically conductive cord extending between a bead portion and a tread portion of the tire |
EP1526005A3 (en) * | 2003-10-23 | 2005-08-31 | The Goodyear Tire & Rubber Company | Pneumatic tire with electrically conductive cord extending between a bead portion and a tread portion of the tire |
US7284582B2 (en) | 2003-10-23 | 2007-10-23 | The Goodyear Tire & Rubber Company | Pneumatic tire with electrically conductive cord extending between a bead portion and a tread portion of the tire |
Also Published As
Publication number | Publication date |
---|---|
JP3045494B1 (en) | 2000-05-29 |
EP1010553B1 (en) | 2003-11-12 |
DE69912724D1 (en) | 2003-12-18 |
JP2000177319A (en) | 2000-06-27 |
US6343634B1 (en) | 2002-02-05 |
EP1010553A3 (en) | 2000-11-08 |
DE69912724T2 (en) | 2004-04-15 |
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